Mandamarri is a town and a municipality in Mancherial district (Old Adilabad district) in the Indian state of Telangana.
As of 2001 India census, Mandamarri had a population of 66,176. Males constitute 51% of the population and females 49%. Mandamarri has an average literacy rate of 61%, higher than the national average of 59.5%. Male literacy is 70%, and female literacy is 52%. 10% of the population is under 6 years of age.
Mandamarri Municipality was constituted in 1952 and is classified as a second grade municipality with 36 election wards. The jurisdiction of the civic body is spread over an area of 38.84 km2 (15.00 sq mi).
There are 9 villages in Mandamarri.